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Question

Two different metal rods of the same length their ends kept at the same temperatures θ1 and θ2 with θ2 > θ1 If A1 and A2 are their cross-sectional area and K1 and K2 their thermal conductivities, the rate of flow of heat in the two rods will be the same if



A

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B

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C

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D

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Solution

The correct option is A


Rate of flow is QT=KA(θ1θ2)l Since (θ1θ2) and l are the same for the two rods, the rate of flow QT will be the same if the product KA is the same for the two rods,i.e. if k1A1=K2A2 or A1A2=K2K1 Hence the correct choice is (b)


Physics

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